Problem in DataGridView using c#

Question

Hello every one, Well in My DataGridView have Chekboxes which is Called From DB . i want to insert checkboxes selected values Data Base. and this is my code. when i click the save button so on that time it is saved a lots of rows at one time click but i want that when i click save button only select one row if you have any idea then let me know... try { con = new MySqlConnection("Server=localhost;user id =root;Password=.;DataBase=test"); con.Open(); foreach (DataGridViewRow dataGridRow in dataGridView1.Rows) { if (dataGridRow.Cells[0].Value != null && (bool)dataGridRow.Cells[0].Value) { cmd = new MySqlCommand("Insert into t_calculation values(" + dataGridView1.Rows[0].Cells[0].Value + "," + dataGridView1.Rows[0].Cells[1].Value + "," + dataGridView1.Rows[0].Cells[2].Value + "," + dataGridView1.Rows[0].Cells[3].Value + ")", con); cmd.ExecuteNonQuery(); MessageBox.Show("Inserted"); } } } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { con.Close(); } thanks in Advance